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This paper investigates low complexity detection for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems with co-channel interference (CCI). We firstly derive minimum mean square error (MMSE) detection based on sorted QR decomposition (SQRD) and modified MMSE SQRD detection for MIMO-OFDM systems with CCI. Although better performance can be achieved by the...
The OFDM transmission scheme is an efficient technique to overcome frequency-selective nature of wireless broadband channels. Different from existing methods which largely focus on data rate maximizaiton, in this paper we investigate resource allocation schemes to improve bit error rate (BER) performance in a point-to-point OFDM system subject to both throughput and transmit power constraints. Specifically,...
There exists an increasing strong demand for internet application in passenger trains, and the wireless broadband coverage along the whole railway is a prerequisite of the internet application in passenger trains. Wireless Mesh Network(WMN) based on 802.16 provides a new solution idea for the wireless broadband coverage of the railway, which is based on OFDM technology to support high-bandwidth data...
A novel coordinated scheduling algorithm for OFDM-based systems in multi-cell scenario is proposed in this paper. The studied algorithm based on the utility function is general for the downlink of networks. The algorithm coordinates the subcarrier assignment over the BS cluster. We first establish the framework for this inter-cell coordinated optimization problem through utility-based method. The...
The uplink power control is essentially important to the link performance and the system stability. By analyzing the SC-FDMA system's interference character, we view the SC-FDMA system as a modified OFDMA system with multichannel model, and accordingly propose a power control scheme composed of intra-cell and inter-cell power control based on the multi-channel model. Especially the Inter-cell power...
Recent work in literature suggests the use of companding transforms to reduce the peak to average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) systems. However, previous performance evaluations assume the availability of infinite bandwidth. In bandlimited conditions, the performance deteriorates as a result of filtering out the out-of-band radiation (OBR). In this letter,...
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